Centrifugal dry coal-separator.



A. ERNST. CENTRIFUGAL DRY COAL SEPARA'IOR'.

APPLICATION FILED OUT. 3, 1908.

42,25 1 Patented Dec. 7, 1909.

Q /cd gmoemtoz %1 1 Guyana-130 2 u l w? m/ ALFRED ERNST, or rrrrsisuae,

PENNSYLVANIA, ASSIGNOR- TO THE COAL AlfTD CUTIE BY-PROIDUCTS COMPANY, A. CORPORATION OF WEST VIRGINIA.

cnn'r'iuruear'. DRY coar-s'sranaroa.

Specification of Letters Patent.

Patented Dec. 7, 1969.

Application filed October 3, 1905. Serial No. 455,991.

1 '0 all whom it mag concern:

Fc it known that I, ALFRED ERNST, a citizen of the United States, residing at Pittsburg, Pennsylvania, have invented certain new and useful Improvements in Centrifm gal Dry Coal-Separators, of which the following is a specification, accompanied by drawings. v I

Although primarily designed as a centrifugal dry separator, the nvention is obviously neither restricted'necessarily to a dry process of separatingnor is itlimited in its application to the separation of coal from slate and refuse.

The object of the invention is to combine a satisfactory degree of accuracy. in separation with a good capacity, and as the invention is of a very simple nature it will be readily understood from the accompanying drawings which illustrate the form in which I prefer to. use it.

In the drawings Figure 1 is a plan view, the'left-hand half being an outside plan view and the right-hand half a view of the rotary separating table and the peripheral receiving chute for the slate and refuse.

2 is a central vertical section.

- L The preferred form of the apparatus illusing at its upper ta le F.

trated comprises an inner stationary support B in which is journ'aled the vertical shaft C driven by the pulley D and carryend the rotary centrifugal Ball-bearings for carrying the \veighta'otating parts are illustrated. The table F consists of an inner member G onto which the coal to be separated is delivered through thestationaly chute H and from which the coal is discharged tangentially by the rel'itrifugal force across the annular interval or intervals J. Beyond and outside of the intervals or surface F of the table which I prefer. to have consist of a horizontal portion F and the rising or inclined portion F. The receiving edge of the surface F should be slightly lower than the surface G if mod crate speeds of rotation are employed, but with very high speeds the'ditferencc between the level of the inner and outer members of the table on the respective sides of the interval J may be oil, as the. centrifugal force will throw the slate with hardly any appreciable drop in crossing the interval. Beneath the table the inner and outer surfaces are preferably connected and united by the J is the receiving member spider arms K, which maybe cast in on piece with the rest of the table.

At L is an annular air blast nozzle supplied by the air pipe M, the mouth of which directs the blast downward through the interval J at an inclination toward the vertical' axis or shaft C so as to facilitate the separation of the lighter particles from the heavier by their being carried down through the interval J. .Beneath the interval J is the coal chute N which is also annularin form and is inclined and convergent to the. dischar e mouth or chute P. Arranged peripheraTly of the outer member F is the delivery chute Q, for the slate or heavier particles to be separated. This is also annular, inclined, and convergent to a delivery chute R.

The operation of the machine will be evi dent to those familiar with the art. The arrow T shows the tangential tendency of the heaviest particles and the arrow U shows the I way in which after being received on' the surface F they slide upward and are thrown off into the chute Q. The arrow V shows the approximate direction of the air blast, and it will be understood that the lighter particles follow trajectories and are delivered in various directions between those of the arrows V and T and passingdownward through the interval J are received in the coal chute N. 011 delivering the mixed coal and slate to the chute H it passes down i i to the center of the table and there, receiving a gravitating movement from the table it is thrown outward by the centrifugal force, passing more or less radially over the interval J The air friction combined with the dmvnwardly directed air blast andthe action of gravity, cause the specifically light-er substances of the same size to be separated'from the heavy, and the smaller particles, which are more easily influenced by the air blast whether of the same or different substance from the'heavier particles, to be carried through the intervalinto the coal,

chute. For this reason it is desirable that 1 the coal be screened before using the selp-' arator, as the separation of particles of tie same size and of different specific gravities will be more perfect than where there are not only differences of specific grav1ty but also great difference in'size of the particles to be separated. The apparatus can, however, be used for separating fine and coarse new principle of nature.

vertically mounted, a rotary table thereon having an inner and an outer member separatedby an interval and each adapted to receive the material and discharge it therefrom by centrifugal force, said outer memher having a rising or inclined portion surrounding a horizontal receiving surface approximately inthe same plane or level as that of the discharging edge of the inner member, for receiving the heavier material 2o discharged across said interval by centrifugalforce, means-for delivering material to be separated to the inner member, and means for catching or receiving the materials discharged from the outer member, for substantially the purposes set forth.

2. A rotary separator comprising a shaft vertically mounted,.a rotary table thereon having an inner and an outer member separated by an interval and each adapted to receive the material and discharge it therefrom by centrifugal force, said outer member havmg a receiving surface approxi mately in the same plane or level as that of the discharg ng edge of the inner member,

for receiving the heavier material discharged across said interval by centrifugal force, means for delivering material to be separated to the inner member, and means for catching or receiving the materials discharged from the outer member, and a blast nozzle directed toward said interval, for substantially the purposes set forth.

3. A rotary separating table having a vertical shaft and an inner member from which the material to be separated is thrown by the centrifugal force and having an outer rotary member presenting a comparatively thin edge which 'is located in approximately the same horizontal plane with the delivering edge of the inner member but at an interval therefrom to divide the material or materials.

4:. A rotary separating table having an inner member from which the material to be separated is thrown by the centrifugal force, and having an outer rotary member presenting a comparatively thin edge which is located in position to divide the material or materials, and-a blast duct having a month which restricts and directs a blast through the interval between the inner and outer member.

5. A rotary separating table comprising two members iii-approximately a single horizontal plane with one or more separating intervals between them, and an air blast duet provided with a mouth or mouths directed toward said interval or intervals.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses, Sept. 28th 1908.

v ALFRED E tNST. Witnesses:

J no. J. GONNELLY, Jos. E. GILBERT. 

